How to pass data to component with one way binding only / without binding at all in ember?

In a template, i am calling component as:

{{comp-name data=controllerData}}

If i change the data in component, controller's controllerData also getting changed due to implicit two way binding. I have two questions:

1) How to make it as one way binding. So that only changes from controller's controllerData propagate to component's data.

2) There should be no binding at all. Means, if i change data in either component or controller. It should not reflect in other thing.